Komatsu H75051 Operation & Maintenance Manual page 167

OPERATION
The work equipment lock switch is a device used to lock the
operation of the work equipment.
The work equipment is locked (the pilot lamp lights up) or un-
locked (the pilot lamp goes out) each time you press the posi-
tion (B) of the switch.
If you release your hand from the switch, it automatically re-
turns to its original position.
Even if you may turn the starting switch to OFF position with
the work equipment unlocked (pilot lamp goes out), the work
equipment is locked (pilot lamp lights up) if you turn the starting
switch to ON position again.
EMERGENCY HST PUMP DRIVE SWITCH
NOTICE
• Use the emergency HST pump drive switch only in an abnormal case.
• Ask for repair of the problem part as soon as possible.
• When the directional lever is in other than NEUTRAL position (N), if the switch is operated to the
position (B), the machine starts to travel at the same time. Take care.
The emergency HST pump drive switch is used to enable driving the machine temporarily if the machine cannot
travel due to the trouble in the pump control system (the HST system caution lamp lights up in red and action
level "L03" is displayed).
When you release your hand from the switch, it returns auto-
matically to position (A). Keep the switch held at position (B)
when operating.
Position (A)
OFF (when normal)
Position (B)
ON (in an emergency)
Setting the switch to position (B) makes the alarm buzzer
sound and lights up the emergency HST pump drive pilot lamp
on the machine monitor.
If the machine cannot travel due to the trouble in the pump con-
trol system, operate the directional lever to F (FORWARD) or R
(REVERSE) position while holding the switch in position (B),
and the machine travels forward and reverse at low speed.
Move the machine to a safe place, stop the engine, and per-
form the inspection and maintenance.
EXPLANATION OF COMPONENTS
3-101